Wow Mark, that's unbelievable growth!
You can almost hide under the canopy already...
Any major difference between Polyon and Osmocote, beside their price and availability
for backyard growers?
Apparently Polyon releases based on soil temperature in addition to moisture content. Osmocote based on moisture only. I've used this one for years on literally 1,000's of hand planted field Christmas trees, fruit, nut, shade, vineyard, etc. when first putting them into the ground. Greenhouse too.
Here's a similar food with an excellent NPK and micros value very similar to my Polyon. 8-9 month.
https://www.greenhousemegastore.com/supplies/fertilizer/osmocote-pro-19-5-8-50-bag-8-9-month. https://www.greenhousemegastore.com/supplies/fertilizer/osmocote-pro-19-5-8-50-bag-8-9-monthMillet, I buy the RootBuilder rolls wholesale and sell it for $3 a panel to Texas growers during our scion exchange meetings. I have a pot size list by number of panels. IOW 4 panels = 15 gal. 6 = 30 gal. 10 = 100 gal. etc. I finish out my trees at 55 - 100 gal. I have a fine Meyer lemon that's in its original smaller pot and doing very well, holding fruit, in spite of it being hit by 13F this past January.
I also wrap/tie a heavy band of wire around the middle. In time those cable ties break.
BTW, ordered this heater and a concentric combined combustion air kit. Sterling GG105. $879 shipped, propane kit installed already. The design and materials used are better than all I have researched. thttp://www.littlegreenhouse.com/resources/Sterling-GG-Specs.pdf